2780457849 has 24 divisors (see below), whose sum is σ = 4333521920. Its totient is φ = 1707741792.

The previous prime is 2780457847. The next prime is 2780457887. The reversal of 2780457849 is 9487540872.

It is a happy number.

2780457849 is a `hidden beast` number, since 27 + 8 + 0 + 4 + 578 + 49 = 666.

It is not a de Polignac number, because 2780457849 - 2¹ = 2780457847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2780457795 and 2780457804.

It is not an unprimeable number, because it can be changed into a prime (2780457847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38472 + ... + 83910.

Almost surely, 2^2780457849 is an apocalyptic number.

It is an amenable number.

2780457849 is a deficient number, since it is larger than the sum of its proper divisors (1553064071).

2780457849 is a wasteful number, since it uses less digits than its factorization.

2780457849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45981 (or 45978 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The square root of 2780457849 is about 52730.0469277242. The cubic root of 2780457849 is about 1406.1730554403.

The spelling of 2780457849 in words is "two billion, seven hundred eighty million, four hundred fifty-seven thousand, eight hundred forty-nine".